That Time I Got Reincarnated as a Slime (2018)

S1E22 Conquering the Labyrinth

Rimuru is desperate to find a solution for the children of Freedom Academy, who are destined for an untimely fate. He devises a plan to have powerful spirits inhabit each child, similar to Shizu's experience, to prevent their early demise. With unwavering resolve, Rimuru guides the children to the Spirit Realm, a place where these superior spirits reside. However, as they venture deeper, they encounter a formidable Golem crafted from magisteel, commanded by the fairy Ramiris, blocking their way.